Artificial stone.



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COATING R PLASTIC- Ce me n1:

asbestos $4 beY av (15 baSbos'GtLllfn s c'mlws eh k av saw our f GROSVENOR ATTERBURY, OF NEW YORK, N. Y.

ARTIFICIAL STONE.

No Drawing.

To all to hom it may concern:

Be it known that I, GROSVENOR Arran- BURY, a citizen of the United States, residing in the city, county, and State of New York,

5 have invented or discovered certain new and useful Improvements in Artificial Stone, of which the following is a full, clear, and complete disclosure.

My invention more particularly relates to an improved hydraulic cement compositionso constituted that nails, tacks and screws may be driven therein after the mix ture has thoroughly set and hardened.

The objects of my invention are to provide an artificial stone of this kind which will be permanent, stron' and fire-proof, and which will readily uni%e or form a bond with ordinary concrete, and which will be so inexpensive as to adapt it for general use in construction work wherever an artificial stone, adapted to receive nails, tacks and screws, is desired, and particularly for use i'rf'surfacing concrete forms and structures to adapt such surface to receive nails, tacks and screws.

My invention will readily be understood from a description of the referred way of practising it, which is as ollows: I form a mixture of cement, preferably ordinary hydraulic or of agbgfios fiber and of a filler having a porous or cellular texture, preferably cinders, crushed and screened to about one-quarter of an inch in size. A substantial amount of sand or 36 finely crushed rock is preferably included in the mixture, and enough water is added to cause the cement to set. The semi-fluid or plastic composition is then cast in blocks for subsequent use, or is applied and allowed to 40 set as an integral part of the structure under construction.

. hihitatharerssatages .hasere s entsfih thecemrasiti may lbelazari llllllfiiilealiiliits, I preferto make the c'dmposition substantially as follows: IiL1- draulic cement 100 parts; short asbes 2 er own to the trade as fi er 23 parts, sand 133 parts, and 0 us] d cinders 160 parts, all part being by weight. Instead of using the s rt asbestos fiber, I may substitute a material hows" u; the trade as rough asbestic or mggstll fi which is a material containing rom o 30 per cent. of asbestos fiber mixed with finely cru hed rock and a certain percentage of unere as estos. In using this material, I

Specification of Letters Patent.

Patented Dec. 7, 1915.

Application filed February 15, 1915. Serial No. 8,206.

employ 100 parts of hydraulic cement, 156 parts of rough asbestic, and 160 parts of cinders, crushed and screened, all parts be- 1ng g ven by weight. The ingredients must go be lntimately mixed, and this may be effected e ther wet or dry, by any suitable mixer, and 1n all cases sufficient water must be used to thoroughly set the cement.

The artificial stone produced by the mix- 5 tures described has a low specific gravity, only about per cent. of that of ordinary concrete, and is cellular or full of minute vo ds, so that H6; nails, tacks or screws are driven therein, the material in the path of the nails, tacks or screws will be driven back into the voids sufliciently to admit the nails, tacks or screws without cracking or splitting the product. The cinders are particularly useful in giving to the product this cellular texture. The short asbestos fibers also assist in producing the porous cellular structure and in addition gives to the product a certain amount of tensile strength or re-g siliency and causes it to bite and hold a nail, tack or screw with sufficient grip for all practical purposes. The product, therefore, is distinguished from ordinary concrete artificial stone in that, after it has thoroughly set and hardened, it is cellular or porousto 5 such an extent as to 'permit nails, tacks or screws to be driven into it, and. in addition, has suflicient tensile strength to enable it to grip and hold nails, tacks or screws. In addition to these characteristics, my composition unites or forms a bond with ordinary concrete and has all of the desirable properties of that composition.

In some cases, in practising my invention,

I may use substitutes forthe cinders in order ta get thedesifed'c s gnatur in the product. Thus I may use fine y mor roducts havin r us" x ure or even sawust in case's e pro uc ism to Be sufiyected to either fire or water. However, where cinders are available, I prefer them to any of the substitutes mentioned, as they are particularly suited for use in practising my invention.

Having described my invention, what I claim is:

1. An artificial stone of'the kind described, comprising cement, asbestos fiber and cinders, and having a texture such that nails, tacks and screws may be driven therein.

EXAM l N ER 2. An artificial stone of the kind defiber and cinders and having a texture such scribed, comprising cement, asbestos and that nails, tacks and screws may be driven cinders in the proportions substantially as therein, substantially as described. 5

specified, and having a texture such that T nails, tacks and screws may be driven there- GROSVEL OR ATTERBURY' in, substantially as described. Witnesses:

3 An artificial stone of the kind de- JOHN W. PETERS,

scribed comprislng cement, sand, asbestos E. A. MCDERMOTT.

Copies 01' this patent may be obtained for five cents each, by addressing the Commissioner of Patents. i I in Washington, D. G. 

